Horseshoe.



B. WILBUR.

HORSESHOE. APPLIUATION mam 1mm, 1909.

Patena June 7, 1910.

I /M/E/VTUR Ann rronf.

BURT WILBUR, OF SYRACUSE, NEW YORK.

HORSESHOE.

To all whom tt may concern:

Be it known that I, BURT VVILBUR, of Syracuse, in the county of Onondaga, in the State of New York, have invented new and useful Improvements in Horseshoes, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to certain improvements in horse shoes, and refers more particularly to the construction of the calks and means for attaching them to the body of the shoe.

I am aware that in the use of horse shoes with removable calks, it is common to provide the body of the shoe and calks with in'- terfitting tongues and grooves, usually dovetailed in cross section and slidably interlocked with each other, the calks being retained in their adjusted position by pins, keys or similar locking devices to hold them against further sliding movement when in use, but in all such devices with which I am familiar, the excessive strains to which the calks are subjected tend to shear the pins or looking keys, thereby loosening the calk and allowing it to become displaced from the shoe. This is particularly true of the heel calks in which the tongues and grooves run lengthwise of the heel of the shoe, and the primary obj ect of my invention is to relieve the looking pins from these excessive strains. This object is carried out in the heel calk by providing the latter with Shoulders which abut against the rear end of the body of the shoe so as to transmit the strain from the looking key or pin to the shoe proper; as, for example, under the strains in drawing a heavy load, under vwhich conditions the shoulders on the calk abutting against the rear ends of the body of the shoe preventfurther forward movernent of the calks relative to said shoe, and thereby relieve the looking pins from excessive strains. The dovetail tongues and grooves in the toe of the shoe and calk extend transversely of the shoe and, therefore, the strains upon the pin are not so excessive as upon the heel calks, but there is nevertheless some lateral strain and tendency to loosen the calk in its bea rings by wearing the tongue and groove, or rather by spreading the sides of the groove apart. In order to obviate this result I have provided the base of the toe calk with a lengthwise V-shape tapering groove in which is fitted a similarly formed key, which, when specification of Letters Patent.

Application filed March 9, 1909.

Patented June '7, 1910.

serial No. 482,378.

driven in place, operates to slightly sprcad the opposite sides of the V-shape groove against the walls of the dovetail groove in the body of the shoe, thereby att'ording a tight fit of the base of the calk in the base of the dovetail groove, or next adjacent to the body of the shoe.

A further object is to provide at least one o f the heel calks with a plurality of, in this instance two, spurs arranged one in advance of the other, the front spur being elongated lengthwise of the shoe to prevent lateral slipping, while the rear spin' is elongated transversely of the shoe to prevent forward and rearward slipping.

Other objects and uses will be brought out in the following description.

In the drawings I*`igure l is an inverted plan view of a horse shoe embodying the various features of my invention. Fig. 2 is a side elevation of the same shoe showing the rear portion of one side in section. Figs. 3, 4, 5 and 6 are sectional views taken rcspectively on lines 3-3, L-e, 5--5 and 6 6, Fig. 1. Figs. 7 and 8 are perspective views respectively of the heel calks.

This shoe comprises a main body la toe calk 2,- and heel calks 3- and -4- the main body lbeing provided at its toe with a boss -5-- having a transverse groove 6- dovetailed in cross section for receiving a dovetail tongue or base -J?- of the toe calk 2-. The dovetail base of the toe calk 2- and its corresponding dovetail groove ;6- are substantially of the same transverse form and size, but are slightly tapered lengthwise in one direction so as to cause the base of the toe calk .-2 to lie snugly with a wedging fit between the opposite sides of the corresponding groove -6- when the toe calk is driven to 1ts operative position. The base of the toe calk 2- is provided with a central lengthwise key seat 8- which is V-shape in cross section and slightly tapered toward one end for receiving a similarly formed key 9--, the latter being driven into the groove 8- after the calk 2- has been inserted into the dovetail groove --G-- so as to slightly spread the opposite sides of the groove -8 against the corresponding sides of the base of the dovetail groove -6 thereby firmly holding the toe calk in position. This toe calk is provided near its dovetail base with a transverse aperture -10--, and the key 9-- is also provided with a transverse groove or aperture, which, when the key is driven in place, is registered with the aperture 10- in the toe calk, said aperture IO- being also registered with similar apertures 11- in the opposite sides of the groove 6- for receiving a looking pin 12--, as best seen in Fig. 3, said looking pin serving to hold the key and calk against relativemovement relatively to each other, and to the main body of the shoe, the transverse pin opening in the key being slightly elongated, as best seen in Fig. 6, to permit said key to be driven in still farther when it is desired to further tighten the calk in place.

The heel calk -3 is provided with a dovetail shank 18 of somewhat less transverse width and vertical depth, than the main body of the calk, forming flat abut` ting faces letand 15 the abutments -14c being' disposed at opposite sides of the real` end of the shank Wl8 while the abutment 15- is disposed above the shank, the abutment --15- serving to engage the rear end face of the heel of the shoe proper, while the latcral abutments -14 serve to engage the rear end face of a boss --1(3 which is integral with the rear end of the main body of the shoe. This boss -16 provided with a lengthwise dovetail groove -17- corresponding in form and size to the dovetail shank -13 which latter is driven into the groove -l7 and together with said groove, is slightly t'apered in one direction to afford a tight wedging fit. As previously lntimated, the dovetall shank 13- is driven firmly into the dovetail groove -17 until the abutment faces -1l and -15 firmly engage the rear end of the body of the shoe and boss 16-, the calk -3- being locked in this position by a tapered pin 18-- which is passed through apertures -19 and -20- in the boss -1(3 and shank 13- respectively.

This calk 3- is provided with a single spur -21- elongated trausversely of the shank 13- and a short distance at the rear of the Shoulders 01' abutments 111- and -15 said spur projecting some distance below the lower face of said shank. The opposite calk --L- is substantially the same as calk 3- except that it is provided with an additional spur 22- elongated lengthwise of the shoe and of substantially the same length as the shank 13- ofi which it forms an integral part; otherwise the same reference numerals apply to this calk as given to the calk 3-, and it is assembled in substantially the same manner.

As Will be seen, the heel calk 4 has its spurs 21 and 22 spaced one from the other, thereby providing the beveled inner face of the spur 21 throughout the length of the spurs. This results in a construction particularly useful in connection With icy streets or pavements, in that it permits each spur to act to a maximum degree and Without interference one with the other, a result not obtainable by combining the spurs, since in such case, it is required that both spurs penetrate the ice in order that either spur may become operative, the joined spur structure having the effect of increasing the size of the sharpened edges of the calks and therebv rendering them less efl'ectlve.

That I claim is 1. A horseshoe comprising a main body having the heel port-ion thereof provided on its under face with a boss, said boss having a longitudinally-extending dovetailed groove therein, and a heel calk comprising a body portion and having a dovetailed shank fitting the groove in said boss and being' of a vertical height greater than the depth of the groove, said shank being of less thickness and width than the body whereby Shoulders are fornied at opposite sides of the inner end of the shank and a shoulder is also formed at the upper side of the inner end of the shank, said boss being provided with transverse openings and the shank of said calk having a groove in its upper face registering with said openings, and a pin passing transversely through the openings in the boss and the groove in said shank for securing the calk to the shoe.

2. A horseshoe comprising' a body having the heel portion thereof provided on its underneath face with a boss, said boss provided with a longitudinally-extending dove-tailed groove, and a heel calk comprising a body provided with a shank doVe-tailed to fit within the dove-tailed groove and having a longitudinally-extending spur, the body of said calk having a spur lying at right angles to the spur on the shank and spaced therefrom, the lower face of said spurs being in the same plane, the said shank having a transverse groove, and the boss having transverse openings registering with said grooves, and a pin in said openings and groove for securing the heel calk in position.

In witness whereof I have hereunto set my hand this third day of March 1909.

BURT l/VILBUR. lVitnesses H. E. CHASE, J. M. Hons. 

